Revert of Change extension icon load errors to warnings (patchset #8 id:140001 of https://codereview.chromium.org/1537473003/ )

Reason for revert:
file read from wrong thread

Original issue's description:
> Change extension icon load errors to warnings
>
> During the Extension parsing step, check if the icon file exists and if not, remove that entry from the dictionary.
>
> Keep the same check during the validation phase and don't apply the workaround to unpacked extensions. This will more strongly discourage new extensions from making this mistake.
>
> BUG=570249
>
> Committed: https://crrev.com/6e8e7d1c49657e82d0e8f2518ad463794346321b
> Cr-Commit-Position: refs/heads/master@{#366253}

TBR=rdevlin.cronin@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=570249

Review URL: https://codereview.chromium.org/1554583002

Cr-Commit-Position: refs/heads/master@{#367080}

8 files changed, 23 insertions, 64 deletions

diff --git a/extensions/common/file_util.cc b/extensions/common/file_util.cc
index 3ddf6d0..90a7846 100644
--- a/extensions/common/file_util.cc
+++ b/extensions/common/file_util.cc
@@ -56,6 +56,16 @@ enum SafeInstallationFlag {
 };
 SafeInstallationFlag g_use_safe_installation = DEFAULT;
 
+// Returns true if the given file path exists and is not zero-length.
+bool ValidateFilePath(const base::FilePath& path) {
+  int64 size = 0;
+  if (!base::PathExists(path) || !base::GetFileSize(path, &size) || size == 0) {
+    return false;
+  }
+
+  return true;
+}
+
 // Returns true if the extension installation should flush all files and the
 // directory.
 bool UseSafeInstallation() {
diff --git a/extensions/common/file_util.h b/extensions/common/file_util.h
index 609b27c..3fda56a 100644
--- a/extensions/common/file_util.h
+++ b/extensions/common/file_util.h
@@ -72,9 +72,6 @@ scoped_ptr<base::DictionaryValue> LoadManifest(
     const base::FilePath::CharType* manifest_filename,
     std::string* error);
 
-// Returns true if the given file path exists and is not zero-length.
-bool ValidateFilePath(const base::FilePath& path);
-
 // Returns true if the given extension object is valid and consistent.
 // May also append a series of warning messages to |warnings|, but they
 // should not prevent the extension from running.
diff --git a/extensions/common/file_util_unittest.cc b/extensions/common/file_util_unittest.cc
index afbcf3c..0bfb8b9 100644
--- a/extensions/common/file_util_unittest.cc
+++ b/extensions/common/file_util_unittest.cc
@@ -419,39 +419,19 @@ TEST_F(FileUtilTest, WarnOnPrivateKey) {
                   "extension includes the key file.*ext_root.a_key.pem"));
 }
 
-// Try to install an extension with a zero-length icon file.
-TEST_F(FileUtilTest, CheckZeroLengthAndMissingIconFile) {
-  base::FilePath install_dir;
-  ASSERT_TRUE(PathService::Get(DIR_TEST_DATA, &install_dir));
-
-  base::FilePath ext_dir =
-      install_dir.AppendASCII("file_util").AppendASCII("bad_icon");
-
-  std::string error;
-  scoped_refptr<Extension> extension(file_util::LoadExtension(
-      ext_dir, Manifest::INTERNAL, Extension::NO_FLAGS, &error));
-  EXPECT_TRUE(extension);
-  ASSERT_EQ(2U, extension->install_warnings().size());
-
-  EXPECT_EQ("Could not load extension icon 'missing-icon.png'.",
-            extension->install_warnings()[0].message);
-  EXPECT_EQ("Could not load extension icon 'icon.png'.",
-            extension->install_warnings()[1].message);
-}
-
-// Try to install an unpacked extension with a zero-length icon file.
-TEST_F(FileUtilTest, CheckZeroLengthAndMissingIconFileUnpacked) {
+TEST_F(FileUtilTest, CheckZeroLengthIconFile) {
   base::FilePath install_dir;
   ASSERT_TRUE(PathService::Get(DIR_TEST_DATA, &install_dir));
 
+  // Try to install an extension with a zero-length icon file.
   base::FilePath ext_dir =
       install_dir.AppendASCII("file_util").AppendASCII("bad_icon");
 
   std::string error;
   scoped_refptr<Extension> extension(file_util::LoadExtension(
       ext_dir, Manifest::UNPACKED, Extension::NO_FLAGS, &error));
-  EXPECT_FALSE(extension);
-  EXPECT_EQ("Could not load extension icon 'missing-icon.png'.", error);
+  EXPECT_TRUE(extension.get() == NULL);
+  EXPECT_STREQ("Could not load extension icon 'icon.png'.", error.c_str());
 }
 
 TEST_F(FileUtilTest, ExtensionURLToRelativeFilePath) {
diff --git a/extensions/common/manifest_handler_helpers.cc b/extensions/common/manifest_handler_helpers.cc
index 36af224d..bfc9e33 100644
--- a/extensions/common/manifest_handler_helpers.cc
+++ b/extensions/common/manifest_handler_helpers.cc
@@ -13,10 +13,7 @@
 #include "extensions/common/error_utils.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_icon_set.h"
-#include "extensions/common/file_util.h"
 #include "extensions/common/manifest_constants.h"
-#include "grit/extensions_strings.h"
-#include "ui/base/l10n/l10n_util.h"
 
 namespace extensions {
 
@@ -35,8 +32,7 @@ bool NormalizeAndValidatePath(std::string* path) {
   return true;
 }
 
-bool LoadIconsFromDictionary(Extension* extension,
-                             const base::DictionaryValue* icons_value,
+bool LoadIconsFromDictionary(const base::DictionaryValue* icons_value,
                              ExtensionIconSet* icons,
                              base::string16* error) {
   DCHECK(icons);
@@ -53,23 +49,7 @@ bool LoadIconsFromDictionary(Extension* extension,
       return false;
     }
 
-    // For backwards compatibility, only warn (don't error out) if an icon is
-    // missing. Component extensions can skip this check as their icons are not
-    // located on disk. Unpacked extensions skip this check and fail later
-    // during validation if the file isn't present. See crbug.com/570249
-    // TODO(estade|devlin): remove this workaround and let install fail in the
-    // validate step a few releases after M49. See http://crbug.com/571193
-    if (Manifest::IsComponentLocation(extension->location()) ||
-        Manifest::IsUnpackedLocation(extension->location()) ||
-        file_util::ValidateFilePath(
-            extension->GetResource(icon_path).GetFilePath())) {
-      icons->Add(size, icon_path);
-    } else {
-      extension->AddInstallWarning(InstallWarning(
-          l10n_util::GetStringFUTF8(IDS_EXTENSION_LOAD_ICON_FAILED,
-                                    base::UTF8ToUTF16(icon_path)),
-          std::string()));
-    }
+    icons->Add(size, icon_path);
   }
   return true;
 }
diff --git a/extensions/common/manifest_handler_helpers.h b/extensions/common/manifest_handler_helpers.h
index e1f901a..b0249c3 100644
--- a/extensions/common/manifest_handler_helpers.h
+++ b/extensions/common/manifest_handler_helpers.h
@@ -6,11 +6,9 @@
 #define EXTENSIONS_COMMON_MANIFEST_HANDLER_HELPERS_H_
 
 #include <string>
-#include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
-#include "extensions/common/install_warning.h"
 
 class ExtensionIconSet;
 
@@ -19,9 +17,6 @@ class DictionaryValue;
 }
 
 namespace extensions {
-
-class Extension;
-
 namespace manifest_handler_helpers {
 
 // Strips leading slashes from the file path. Returns true iff the final path is
@@ -30,10 +25,8 @@ bool NormalizeAndValidatePath(std::string* path);
 
 // Loads icon paths defined in dictionary |icons_value| into ExtensionIconSet
 // |icons|. |icons_value| is a dictionary value {icon size -> icon path}.
-// Returns success. If load fails, |error| will be set. Non-failure warnings may
-// be added to |extension|.
-bool LoadIconsFromDictionary(Extension* extension,
-                             const base::DictionaryValue* icons_value,
+// Returns success. If load fails, |error| will be set.
+bool LoadIconsFromDictionary(const base::DictionaryValue* icons_value,
                              ExtensionIconSet* icons,
                              base::string16* error);
 
diff --git a/extensions/common/manifest_handlers/icons_handler.cc b/extensions/common/manifest_handlers/icons_handler.cc
index 52597e5..20ad025 100644
--- a/extensions/common/manifest_handlers/icons_handler.cc
+++ b/extensions/common/manifest_handlers/icons_handler.cc
@@ -64,7 +64,7 @@ bool IconsHandler::Parse(Extension* extension, base::string16* error) {
   }
 
   if (!manifest_handler_helpers::LoadIconsFromDictionary(
-          extension, icons_dict, &icons_info->icons, error)) {
+          icons_dict, &icons_info->icons, error)) {
     return false;
   }
 
diff --git a/extensions/test/data/file_util/bad_icon/manifest.json b/extensions/test/data/file_util/bad_icon/manifest.json
index 27b7dac..e3846e4 100644
--- a/extensions/test/data/file_util/bad_icon/manifest.json
+++ b/extensions/test/data/file_util/bad_icon/manifest.json
@@ -2,9 +2,7 @@
   "name": "My extension with a zero-length icon",
   "version": "1.0",
   "icons": {
-    "16": "good-icon.png",
-    "32": "missing-icon.png",
-    "64": "icon.png"
+    "16": "icon.png"
   },
   "manifest_version": 2
 }
diff --git a/extensions/utility/unpacker.cc b/extensions/utility/unpacker.cc
index be0a4b5..c230f82 100644
--- a/extensions/utility/unpacker.cc
+++ b/extensions/utility/unpacker.cc
@@ -187,8 +187,9 @@ bool Unpacker::Run() {
   // Decode any images that the browser needs to display.
   std::set<base::FilePath> image_paths =
       ExtensionsClient::Get()->GetBrowserImagePaths(extension.get());
-  for (const base::FilePath& path : image_paths) {
-    if (!AddDecodedImage(path))
+  for (std::set<base::FilePath>::iterator it = image_paths.begin();
+       it != image_paths.end(); ++it) {
+    if (!AddDecodedImage(*it))
       return false;  // Error was already reported.
   }